Tech Tips Newsletter

UE SOUND BITES . . . The Ultrasound Newsletter published by UE Systems, Inc.

Information… Product News… Advice… Dialog

Volume 7, Issue 3       April, 2006

T O P I C S

The Right Tool For the Job

Ultraprobe Tip

Comments & Contributions

Training Schedule



This newsletter is dedicated to you, the reader with the goal of improving your ultrasonic inspection skills and enhancing your value to your company or clients. As always, we welcome your participation. If you have questions or seek advice about your inspection techniques or programs, or if you wish to share your experiences with others, please e-mail your contributions to us at info@uesystems.com.

The Right Tool For the Job

When someone tells you to take a screwdriver with you for a specific job, do you take just any or do you have to ask the type and size or if it will require an offset screwdriver? We all know screwdrivers are great tools to turn screws. But to do the job correctly we need to know the details before we walk out of the tool crib. The same concept is true for condition monitoring. Specifically before performing an inspection, it is advisable to visit the test area and walk around to determine what equipment you’ll need. One of the details to consider is whether the test subject will be accessible or not. Is the bearing housing covered? Are pipes close together or high up in the ceiling? Are cabinets locked? The details will help you prepare and make your inspection more efficient.

While most ultrasonic testing can be performed with the standard modules: the contact and the scanning, there are applications where special modules will be needed.

For situations where leak detection is difficult due to pipe arrangements, such as when pipes are aligned too closely for the Ultraprobe to pass through, a new bendable scanning module can help. The “U-Bend” has a scanning transducer attached to a flexible tube that can be bent to odd, sometimes radical angles to help inspectors identify the exact location of a leak. The U-Bend is available for all the analog and digital Ultraprobe models. View the U-Bend Models: http://www.uesystems.com/prod_acc_U-Bend.asp

There is another version of the U-Bend, “Tele-Bend” is a flexible module positioned on a telescoping wand that extends up to 56”. This can help locate odd-angle leaks in hard to reach piping. To view Tele-Bend, click here: http://www.uesystems.com/prod_acc_tele-bend.asp

When testing high voltage equipment in substations or leaks in high places, the inspector is often limited in terms of distance to the test equipment. The parabolic microphones such as
the Long Range Module (http://www.uesystems.com/prod_acc_lrm.asp) or
the Parabolic Dish (http://www.uesystems.com/prod_acc_uwc.asp) are tools that will help. With a tight focal area and increased sensitivity, these modules enable user’s to locate emissions at great distances. They are also used in some unique situations to monitor bearings that are high up or difficult to reach. As an example, one inspector uses the parabolic dish to monitor gross bearing faults of bearings in robots where the robots are fenced off and accessibility is a major issue.

For low level leaks, such as you might encounter with vacuum leaks, the Close Focus Module is an accessory that will help. The unique design of the probe tip provides for little to no attenuation of the low level signal as it directs the sound to the transducer where it is electronically massaged and amplified to help identify the leak (http://www.uesystems.com/prod_acc_cfm.asp)

There are instances where access to a bearing housing makes it difficult to place the standard contact probe and view the display panel easily. For these situations, the RAS-MT, the magnetic mount transducer with cable is used. An inspector can place the magnetic transducer on the bearing housing, plug the module (RAM) into the Ultraprobe and view the display panel while listening to the bearing sound. This “RAS-MT” configuration can also be used in a similar mode to test valves where access is difficult. (http://www.uesystems.com/prod_acc.asp)

For those conditions where accessibility is an issue, such as with enclosed cabinets, the RAS/RAM is an answer. The RAS (Remote Access Sensor) is permanently affixed to the test point and a cable is run out through a test port. The RAM (|Remote Access Module) is attached to the cable and plugged into the front end of the Ultraprobe housing where the information is heard in headphones and viewed on the display panel. The data may then be logged and recorded. (http://www.uesystems.com/prod_acc_ras_ram.asp)

Ultraprobe Tip:
Sonic deflection can fool even the most experienced inspector at times. This is why it is important to incorporate a confirming method into your inspections. Some of these methods include: sealing the rubber probe end to the suspected leak site, scanning around the leak area 360 degrees(in all directions), using bubble solutions or using a note pad. The note pad is simple. Aim the probe at the leak site (close-up) and then move the note pad between the probe tip and the leak site. If the leak is there, every time the pad comes between the leak site and the probe end, the sound will drop off.


Comments and Contributions:

Some inspections involve hot test points or areas. As an example, some bearings run at high temperatures. At times this is due to the surrounding environment and, assuming the bearings have been selected for this environment, the heat can be “normal. But what about inspecting these bearings with ultrasound? Most often, the standard stethoscope (contact) probe will work since the time to listen to a bearing is often not very long. The same is true when testing steam traps. The test duration is usually not long enough to affect the readings. However for extreme cases, there is a solution, especially if the test points have to be monitored for a long period of time. We have a high temperature isolation device that allows the attachment of a fixed sensor such as the Ultratrak 750 to monitor the test subject. As an example, the Thermal Isolation Device will reduce a 300 degree C mounting point down to about 40 degrees C.


Training Schedule:

Training classes are once again filling up rapidly. Please be sure to register early since we limit the size of these classes to provide a better learning environment.

DATES CLASS LOCATION
April 24 - 28 Level I Monterrey, Mexico
May 2 - 3 Steam Examiner Edmonton, Canada
May 8 -12 Level I Charlotte, NC
June 12 - 16 Level I Portland, OR
June 12 - 16 Level II Elmsford, NY
July 3 - 7 Level I Singapore
July 17 - 21 Level I Milwaukee, WI
August 7 - 12 Level I Rochester, NY
September 11 - 15 Level I San Jose, CA
September 11 - 15 Level I Toronto, Canada
October 16 - 20 Level I Kansas City, MO
October 18 - 19 Steam Examiner Green Bay, WI
November 13 - 17 Level I Phoenix, AZ
November 13 - 17 Level I UK
December 4 - 8 Level I Birmingham, AL
To register: email: info@uesystems.com
or register on-line: http://www.uesystems.com/forms.asp?frmID=10



More articles will be posted periodically. Please check back.
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UE SYSTEMS, INC.
Toll Free: 1.800.223.1325
Phone: 914.592.1220
Fax: 914.347.2181
e-mail: info@uesystems.com


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